The Welshman, 27, is battling to be fit to defend his title in Moscow after a calf tear.

But he’s been keeping a close eye on his training partner, Child, at UK Athletics’ warm-up base in Barcelona.

And Greene reckons the time is right for the Scottish record holder to break into the elite and show how far she’s come since missing out on last year’s Olympic final.

He said: “Eilidh’s made big advances technically and mentally as well. She did well indoors and that’s given her the confidence to go off a lot faster in her races.

“I think she’s still got one or two technical issues that she can sort out and drop quite a bit of time if she gets it right on the day.

“She hasn’t reached her peak yet which is exciting. She and Perri Shakes-Drayton are pushing each other on a bit as well so I’m keen to see her give a good account of herself out there. I’ve seen her in training on a regular basis and know she can produce good times.”

Greene admits he’s furious about the drugs cheats who have dragged athletics through the gutter in recent weeks.

With stars like Tyson Gay and Asafa Powell blacklisted he reckons the sport will have to fight to win back trust. First, he says, should be to look at how cycling rebounded from Lance Armstrong’s decade of rule breaking.

He said: “Cycling had its bad moments but it came out the other side and it’s booming now so hopefully athletics can come out stronger.”

Winning in Moscow is Greene’s priority but he admits he may struggle to match the gold he claimed in Daegu two years ago.

He said: “I won’t know how it feels until the Monday. I’ll give it the best shot I can but it’s not ideal preparation.”